Skyfold recently increased it’s sound transmission performance to an industry best 57 STC. This is roughly equivalent to a 12 inch thick concrete block wall. But what makes this amazing is the Skyfold Elite wall with a 57 STC can fold up into the ceiling in just minutes. Imagine the applications in offices, schools, auditoriums, banquet facilities, or anywhere! A sound-proof wall that can move in just a minute or two.. Acoustic engineers are happy that there is finally and operable wall that may meet the LEED School requirements for acoustical performance.